In PHP, what is the best approach to compare and highlight differences between two text strings?

When comparing two text strings in PHP and highlighting the differences, the best approach is to use a library like `Text_Diff` which provides a simple way to compute the difference between two strings and highlight the changes. This library can generate HTML output with added and removed sections highlighted for easy comparison. 

<?php
require_once 'Text/Diff.php';

$string1 = "This is the original text.";
$string2 = "This is the updated text.";

$diff = new Text_Diff('auto', array(explode(' ', $string1), explode(' ', $string2)));
$renderer = new Text_Diff_Renderer_inline();

echo $renderer->render($diff);
?>

Keywords

PHP text strings compare highlight differences text comparison

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